JPS5847535A - Recessed mark working of welded pipe material - Google Patents

Abstract

PURPOSE:To manufacture a transport pipe of a desired diameter which has executed recessed mark working to its inside surface, by making a welded pipe manufacturing band plate press-contact in advance with a roll having a linear or dot-like projecting pattern, making it pass through, giving a desired pressed mark to one side, and after that, executing its forming. CONSTITUTION:A band plate 4 for manufacturing a welded pipe is made to pass through under necessary pressing force between a cylindrical roll 1 having a linear or dot-like projecting pattern 2 on its outside circumferential surface, and a cylindrical roll 3 whose outside circumferential surface is smooth, and a band plate 5 which has carved the projecting pattern 2 of the cylindrical roll 1 on one surface of the band plate 4 is obtained. This band plate 5 is formed to a pipe which has set the recessed mark side to its inside, by which it is possible to obtain a transport pipe which has executed recessed mark working to its inside surface so as to be used for air transport of a pulverulent and/or granular body.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a transport pipe whose inner surface is provided with concave markings useful for pneumatic transport of powder and granular materials.

It is widely known that when powder and granular materials, especially pellets of d-plastic resin, are transported by air, the surface of the transported material melts due to friction with the inner wall of the transport pipe, and fluff in the form of A/A is generated. be. It is also well known that as a measure to prevent this from occurring, the inner wall surface of the transport pipe is made rough, has irregularities, or is processed in the form of striations.

Examples of processing methods include making the inner wall surface of the tube a satin finish by sandblasting, and passing a knurling or the like through a knurling tube to create indentations.

However, in all of these methods, the tube is formed and then processed, so it is complicated to prepare tools for each diameter of the tube.

In addition, when using the Sand Plus and To methods, the generation of film-like fluff is suppressed, but the generation of powdery substances increases.
In addition, there are disadvantages such as short service life and the need for reprocessing every few years, and machining methods that use a low tool are difficult to make indentations of the desired depth on the pipe and inner wall. There are cases where the crimping is quite strong and it is difficult to repair it.

The present invention aims to eliminate the above-mentioned disadvantages, and in the manufacturing process of two welded pipes used for transport pipes, the material is attached to a strip at the stage of the material before being formed into a pipe, and the strip is passed through. Desired indentations are continuously made on one side of the plate, which is then formed into a welded pipe with concave indentations on the inner wall surface.

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the following:
FIG. 3 is a perspective straddle view of a roll device that applies concave marks to one side of a strip 4. FIG.

The edge 2 of the turn is engraved, and the circumferential surface of the edge roll 1 including the edge 2 is given sufficient hardness by hardening or the like so as to withstand repeated indentations. , the circumferential surface of the socket -/L'8 is smooth and does not require particular hardness. Edgeroll 1 and Ukero tv8
It is pivotally supported with the strength to withstand the required pressing force by sandwiching the Fi band plate 4.

The strip plate 4, which is held between both ends -μ and a desired pressing force is applied,
It travels in a direction perpendicular to the low μ axis by a traction device (not shown), and as it advances, the edge opening, j/l/1, and receiving roll 8 rotate, and the crimped portion of the roll (turn) is inscribed as a concave mark.

FIG. 2 is a partial side cross-sectional view illustrating the state in which the recess 5 is inscribed by the edge 2 of the edge roller IL/1, and FIG. 8 is a partial front view.

FIG. 4 is a partial plan view showing an example of a pattern of concave marks 5 intaglio-engraved on the band plate 4. As shown in FIG.

In this way - band plate 4V with concave markings on the side surface
After i, a normal welded pipe forming process is performed using the concave knee as the inner wall surface.

The single-mark machining of the present invention performed as described above has the following advantages over conventional machining methods.

If there is roll equipment capable of processing the 1K required maximum diameter strip, it is possible to process various warp strips, so it is economical as there is no need to prepare processing tools for each pipe diameter as in the conventional method.

Since the step of forming the concave marks can be carried out simultaneously with the step of cutting the strip as required, the conventional pipe manufacturing steps will not be increased by implementing the present invention.

Secondly, it is possible to determine the depth and pattern of the concave marks to be processed. In the conventional method, there was a narrow range of choices regarding the depth and strength of the dents and the pattern, but with the method of the present invention, selections can be made according to needs, greatly improving the effectiveness of dent processing. I can do it.

Eighth, in the unlikely event that the strip plate is deformed or distorted due to the machining of the concave marks, 1. However, since it has not yet become a spherical shape, it is easy to correct it.
Can create tubes with precise shapes.

[Brief explanation of drawings]

FIG. 1 is a perspective explanatory view of a 50-hole device for machining concave marks according to an embodiment of the present invention, FIG. FIG. Further, FIG. 4 is a partial plan view showing an example of a pattern of concave marks. 1... Etsujirol. 2...Etsuji. 8...Receive roll. 4...Strip plate. 6... Concave marks. Patent application Hitoshi Sanko Air Equipment Co., Ltd. CEO Yu Moriyama Procedural amendment (spontaneous) February 7, 1980 Commissioner of the Patent Office Haruki Shimada Indication of case 11 Patent application No. 148095 2 of 1982 , Title of the invention: Machining of concave marks on welded pipe material 3, Person making the correction 4, Subject of correction 1, Page 4, page 4, next to line 7, insert the following description. [FIG. 5 is a partial plan view showing a pattern different from that in FIG. 4, and in this case, the work is performed by passing the roll multiple times. 2. Insert the following description next to line 15 on page 5 [FIG. 5 is a partial view showing an example of the pattern of concave marks obtained by passing the roll several times. 3. Added attached drawing (Figure 5). Figure 1115

Claims (1)

[Claims] A strip plate for welded pipe production is passed between a cylindrical roll having a linear or dotted convex pattern on its outer circumferential surface and a cylindrical roll having a smooth outer circumferential surface under the required pressing force, Indentation processing of a welded pipe material, characterized in that one side of the strip is provided with indentations in which a convex pattern of a cylindrical roll is inscribed, and then the strip is formed into a tube with the indentation side facing inside. .